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Vulnerability record · CVE-2026-81736 · published 16 September 2026

CVE-2026-81736: If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that…

If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

7.5 CVSS 3.1 High EPSS 0.86% · top 43.2% CWE-1050 · CWE-1050 Awaiting Analysis
7.5CVSS 3.1 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Sep 2026Last modified by NVD

Description

If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://downloads.isc.org/isc/bind9/9.20.29
https://downloads.isc.org/isc/bind9/9.21.26
https://kb.isc.org/docs/cve-2026-81736

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Source: NIST National Vulnerability Database (record CVE-2026-81736), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.